<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Tính tuổi</title>
</head>

<body>
<form name="bt1" method="post" act action="tinhtuoi.php">
 Tuổi: <input type="text" name="txtuoi"/>
</form>
<input type="button" name="Gửi" value="Gửi"/>
</body>
</html>
